Which is?
Meanwhile some people are expecting that somehow a massive amount of nodes (thanks to the artificially kept small blockchain) will be run on a network that nobody can really use but a few niche areas.
Basically, who will care running a node at all?
Oh... that... well..it would be a legitimate point if it made any sense at all..unfortunately it doesn't.
Without nodes there's no Bitcoin and without Bitcoin there is no payment channels, sidechains, off-chain services, nothing.
So basically by running a node you are not only supporting Bitcoin but all of its ecosystem. Imagine when nodes get commoditized and every one can set easily set up one and maintain it a little to no cost, the ultimate decentralization!
Of course that can't happen if you bloat the blockchain so much that you'd need specialized hardware/datacenters to run it.