I think it is important to mention that spending bitcoin means spending actual bitcoin. People can do whatever they please, obviously, but using auto-convert features to "spend" bitcoin doesn't support the network's growth by increasing the number of bitcoiners.

It might bring more speculative investors and therefore help ngu because the company providing the service will likely do very well. But it won't necessarily help the decentralization and other features that make bitcoin such a powerful technology favouring freedom. P2P value transfer does.