As much as some of us like to get nostalgic for our '80s and '90s classics (sounds odd, doesn't it?), life goes on.
Ford, Chrysler, and pretty much everything from overseas isn't wasting time and technology reminiscing when 245hp ('87 GN) or 385 hp ('90 ZR-1) was a lot of power. So neither should General Motors.
When there are Japanese, mass produced family econoboxes pushing the 300 hp mark, a 2016/17 Turbo Buick with 245 hp that's trying to look like a Regal designed in the late '70s isn't exactly going to impress anybody. It would be the laughing stock, actually.
It would say that in the last 27 years, GM hasn't evolved at all technologically.