i dont think anyone is running out of space within the first year. I think by year 3 there would be enough market where the prices are way cheaper. Also they dont even recommend current gen games on the SSD vs placing them external anyway.
Gotta be honest, mine will be filled on day one. I'll probably buy the XSX cartridge at launch as well. I'm not gonna put up with multi-minute load times in any of my current games any longer than I have to.