I give this about a 5% chance of success, and 1% market share, maybe less, if it does succeed. That's still more than 10 million units per year, so not a failure. But this isn't going to be your next phone.

If it falls much below that unit volume, the scheme implodes because the optional components will not find enough of a market to get manufactured.

In order to succeed, the internal connectivity scheme needs to not go obsolete over at least two, and preferably three product generations.

It also needs to find a market. People still build their own PCs for gaming, for lab automation, and other distinctly minority pursuits. So far, the niche for this product seems to be "people who find the idea attractive but can't articulate an actual need."