This isn't just pandering anymore. It's the second remake of the damn games. It's Gen 4's turn for the remake. This isn't fair to the vast majority of the fan base who buys these games.
I'll be honest here, I'm 100% certain that Pokemon Go wouldn't have been as successful if it included all 700'ish that was available to Nantic at the time. Part of the appeal with the first 150 is their more simplified design (because of hardware limitations) and because of simplicity. "Catching them all" seems easier when there is only 150.
You guys just seem a bit unreasonable here. You will get your game, let people who enjoy the 150 have their game. The hardcore fanbase will just have to accept that Gen 1 will be pandered to more than any other. Gen 1 was the phenomenon back in the days. Nostalgia sells. And Nintendo/GF won't ignore this market.