Something like Sandstorm[0] might be able to solve this, since then a person would hypothetically only need a single server (with a nice web interface) that they install all their decentralized apps into. In practice I think modifying the apps to be compatible is too much overhead. But I think something in the same vein could work.

I'm sure @kentonv has some ideas on what the main roadblocks to adoption are.

[0] https://sandstorm.io/