Lambda is too expensive at the moment, sure. But I think we all know that the costs will, over time, go through the floor, and in 5 years time nobody will want to create server software using anything else.
What does it cost to host lambdas? Not a lot. So we are good from that PoV.
Will it be commoditized, or will there be crazy markups? Can any random guy set this up? If you really want to check this, try setting one up yourself and see if there are any roadblocks. (I didn't)