I have been watching this thread on and off as it lengthens (even though I didn't go to W&P this year). Here are a few of my thoughts about some things that have been talked about for years and some just this year;
1. I am of the opinion that shows - especially big ones like this - have three distinct periods in their time line, a period of growth from their beginnings when it's new and exciting and so more people go along year on year. The second period is of some stability when a show has found a level and is still good so is on something of a plateau and the final period is one of decline as it slides off the plateau. This decline can vary and is affected by all sorts of things and factors; weather, moves of venue, change of organisation, changing fashions, rival events etc etc. (I saw exactly the same thing happen to something nearby years ago - the Kent Custom Bike Show. It started at a cafe on the A20 boomed, moved venues and boomed but eventually declined and ended). Then, in this final period, grumpy old blokes sit around saying, 'it's not as good as it was...' Basically, W&P's glory days are over and they ain't coming back.
2. Some people on this thread want a big show full of rarities and expect everyone to be as reverential as them. It isn't going to happen - the only way big shows can break even is if big numbers pay to come through the gate. People don't all want the same thing from a show - one group might want it all to be WWII American vehicles, others need to sell stuff, some want to dress up and strut about...
3. Add in the cost of many vehicles, a factor that limits the hobby for many, so - to get big numbers - it's inevitable that there will be impostors and 'odd' replicas. Those people pay their fees that help put the event on so being snobbish about them serves no purpose apart from giving grumpy blokes something to whinge about...
4. Too many Land Rovers? Maybe but they are pretty much - in Britain anyway these days - the only affordable/entry level/call it what you like military vehicle. If anything surprises me about Land Rovers, it's the fact that there aren't more Malaya/Aden/Kenya/Ulster dioramas
5. No fairgrounds? It's about getting numbers and families through the gate - mind you Carter's Fair with its AEC Matadors always appealed to me and I'll watch a Wall of Death wherever there is one. If you want a show full of a specific type of armour or vehicles then organise a small, specialist event that isn't reliant on day visitors - Overloon works for example - the more specialist something gets, the fewer it appeals to.
6. Lack of traders? The traders aren't charities so won't come if they don't make a profit. It costs them a lot to make that profit too - staff, transport, subsistence, security, (ferries in some cases) plus plus... By this line of thinking - there will be lots of Jeep traders because there's lots of Jeeps and owners. eBay has also changed the face of selling for traders too.
Anyway that's a few of my thoughts but the reason I didn't to to W&P in 2019 (and am unlikely to go ever again) is that I can't be bothered to drive to Kent from Yorkshire to use horrible bogs and stand in a beer tent surrounded by Nazis... especially after I got a sh**** email from one of the organisers after mentioning the poor toilets in a magazine article.
Finally, here's a picture of one of my quasi-military Jeeps on its big alloy wheels - it's been to Normandy, W&P, Elvington, Bovington and more over the years (but don't make the mistake of thinking that I have got it because I can't afford a 'real' one as I have owned it for 30 years).