How long before Hasbro buys out OneBookShelf? Sure, it's a question that can't be answered yet, but it is an interesting thought.
All of WotC's digital products are being sold through OBS (except it's VTT products, which are on Fantasy Grounds - that's a whole 'nother post)
At this point, WotC / Hasbro is the dominant publisher on OBS and the Dungeon Master's Guild is going to lead to a HUGE amount of licensed D&D 5e products. That glut has the potential to seriously tilt the online market towards 5e if it hasn't already. Assuming a limited pool of money to be spent by consumers on RPG products, the Dungeon Master's Guild can seriously drain that pool.
When does it become more profitable for Hasbro to own it's online distributor for it's PDF releases?
What does this mean for the smaller publishers?
When the Dungeon Master's Guild was announced, most of the fear I heard was "it's going to be the D20 era again, with a few gems hidden in piles of dung." Now, I think the fear should be for the market shift and the potential harm to publishers that aren't in the DM's Guild Market (which has huge restrictions and lack of ownership - again, another future post)
The last event that had this much influence on online distributing of RPG products came with the RPGNow / DriveThruRPG merge. Was that merge good for consumers and small publishers? I truthfully don't know, but less competition rarely benefits those spending the cash.
Now, has the current trend benefiting WotC / Hasbro and has it boosted D&D 5e? Is it adding dollars to the coffers of OBS? Of course to all. The question is: What is the long term cost to the hobby?