The full Devroom situation was not news to us, in fact we already foresaw this happening long before we decided to introduce devrooms.
While devroom 1 had a larger seating capacity because we were able to use audi 3 fortunately, devroom proposers should understand that a “devroom” talk will most likely happen in a “room” and not an auditorium. Devrooms are meant for a niche topic which fewer people will be interested in by nature of the topic. If you feel your presentation is broad enough for a larger audience, consider applying for the main track (which has a very different criteria of selection - for eg. we select very few talks that are about newer projects). Note that devrooms also had the option to recommend certain talks to the main track, and a few devrooms did move some of their talks because they felt they can appeal to a larger audience.