I was worried about this problem a long time ago. To me it seems that every blockchain which is not centralized in some way is headed down this path. Yet the absolute euphoria about Bitcoin's future and disruptiveness continues. What gives?
Mate you need to understand that you use wallets which allow custom fees like electrum and then leave the transactions going on. They will take time to confirm but that does not mean that they will forever be static in the blockchain. If you have a bunch of transactions going on everyday then its another question - use bulk transactions (send to many feature) for that.
This has nothing to do with blockchains being centralized or not. I dont know where you got that idea from. Care to share the source with us?