It's a bit unfair to make absolute statements like that. As with everything else, there's a risk calculation involved. If the PaaS/SaaS company delivers a subs

It's a bit unfair to make absolute statements like that. As with everything else, there's a risk calculation involved. If the PaaS/SaaS company delivers a substantial improvement over the existing solutions, the risk may very well be worth it. Conversely, if you're replacing a tried-and-true solution with something shiny just because it happens to have a lot of buzz around it, well that can be a risk miscalculation. (Of course, the shiny new thing may be worthwhile because it attracts a certain class of talent, but shiny for the sake of shiny is not going to yield much good.) That's why larger clients sometimes invest in a startup, to help ensure some stability by having better access to the internals. (Yet, I've seen that fail too: some startups outright lie to their investors, and that ends just the same way as you'd expect.)