Yes categories have come and gone but things have been changing. GT3 won't die out in 5 years that's absurd.
Regulations have a rough lifespan of 10 years. Massive expansion will increase their lifespan marginally, but their deaths will be all the more abrupt and disastrous. If GT3 survives more than 5 years in its current state, it'll be a pure miracle or the class will be well on its way out.
Besides look at GT2. GT2 has been roughly the same since the late 90's
GT2 doesn't exist anymore, and it was altered quite significantly throughout its lifespan to get to GTE. It's also a terrible comparison, because it never spiraled wildly out of control and became something it very much wasn't in the first place. If you want a good comparison, look at Super Touring - they're going through all the same steps as each other.
and has a bright future ahead of itself.
How?
The cars are faster but so what?
Because it's a gentleman, customer formula? It's not a few tenths faster, it's like different category faster. The fact that:
The FIA has been massaging the regs of all categories
shows how stupid it's become. GTE should be the top level - it is considerably more expensive, it is a factory team formula, and the cars are ground-up racing cars. GT3 cars were designed as a largely production based formula, and they're desperately clinging on to that as they touch GTE in terms of performance. Half the price, for gentleman drivers, with factory teams involved, with road car parts instead of largely specialised hardware, being very nearly as fast as the very top tier? How can you not see the major flaws in that?
So they're insanely fast.
...It's a customer/gentleman driver/production based formula. It's everything "insanely fast" goes against.
If you want slow GT3 down, just use the current GTE rules.
With more downforce? With more specialised parts? With no driver aids? That's a lethal concoction.
Don't make them bloody road cars with wings.
That's what they were at inception, that's what they're still trying to be, the class was just fine back then. You still don't seem to get that.
None of this is about what you would like to see. This is about making sure the end of this "golden era" doesn't spell an international collapse for GT racing, leaving us scratching our heads about what to do next. It will die. All categories do. There is no getting away from that fact. But what you can do is make sure the short-term goals don't outweigh the long term ones - and nothing indicates that several major GT series will have a life after GT3 goes.
Such a shame, IMHO those were the best years for BTCC. The cars were fantastic.
Same thoughts echoed here, but at least they got BTC-T out quickly - they were quite a successful set of regulations, and it kept an almost completely dead series on track.