Should everyone run a LN node?
that would be amazing, but in reality it's not going to happen, imo.
Not everyone needs to.
It's like saying everyone should run an email server, won't happen. But on LN if there are too few fees go high and it's an incentive to build more nodes, but it will be a thing for experts IMO.
But maybe one day after solving the DNS nightmare or tor becomes faster, there will be some small server with reliable hardware and software that grandmas will be able to use, just like using a phone. Connecting everything via web interface and qr codes.
Growing TOR is probably more of an issue than growing Lightning, IMO.