I have been thinking for a long time the possibility of creating a hotel/travel booking platform that will help the hotels to overcome the huge amount of booking commission they have to pay. Basically a platform which encourages direct booking for hotels. The platform will have a different revenue model compared to ota.
Hotels do not pay a huge amount of commission anymore. Travel sites are always getting squeezed to shrink commissions. The hoteliers themselves drive direct bookings with their advertising efforts (e.g., guaranteed lowest rate when booking direct).
Having worked for the hoteliers association, I feel you need to check each and every one of your assumptions. I think you will find reality is different than how you've imagined, especially in what motivates hoteliers. Many aren't even making decisions about marketing, they hand it over to hotel management companies.
You will need a lot of cash to get this off the ground. Hotels will want to see you spending $$$$$$ on marketing from day 1. There are so many of us around the world supporting this cause but the reality is now and for the next few years that OTAs will be needed more than ever.