I am not sure if it will force us offsite as we are DVC members, but we do occasionally add an extra trip or two per year that are out of pocket. It would make us re-think going as often.
That being said, we had the opportunity to do a split stay a few weeks ago with the first part of the stay being offsite at the Marriott World Center and the second half being at the Polynesian.
My wife and I both agreed that the experience isn't even close to the same. This is not just comparing DVC to Offsite or Deluxe to Offsite. We have also split stay with a value (Pop Century) and offsite, as well as a Mod (Port Orleans Riverside) and Offsite, and it just feels different. It's hard to explain, but we feel more in the "spirit" onsite, and stress levels are so much less than back at home in the grind, or even the stress of finding a parking spot or catching the shuttle. It's really not even close for us.
We tried saving money going offsite and we end up paying for a rental, or for shuttles to Disney and back, or worrying about shuttle schedules. The food was also more expensive than I would have thought being offsite, unless you drive to a
Walmart or some other local store. It just wasn't worth it. No matter how nice the offsite accommodations were, and some were very nice, the experience wasn't even close to being onsite surrounded by Disney, and in some cases being within walking distance to the parks. We would rather be at Pop Century than a condo or beach house with private pool any day.
My wife even said on numerous occasions over the years as we left Disney property to go back to our hotel, condo, etc., that it just feels different when you leave. I agree, when we finally got to the second leg of our most recent stay which was onsite, it felt so much more comfortable, like we were back home.
So, if Disney does keep cutting, I don't think it will force us offsite as much as it will curb our Disney appetite. When we do Disney, it will definitely be all Disney, onsite from now on, we just may not go near as often.