The storage space is not ideal but its also super trivial.
How many games do you guys play at a time, 10? Especially when you take into account the the biggest games are normally single player campaigns, I think its fine. Games like COD have yearly replacements, and games like Read Dead Redemption come around once every 5 years. Plenty of games are also tiny, the average size of a game this gen is way closer to 40GB then it is to 100GB. Next gen I think we will see sizes vary drastically & the average being around 80GB and the max being 200GB in extremely rare blockbuster instances.
Either way it will not be a problem, just as 500GB was not a problem this gen.