The cuts you're referring to were elements intended for enhancing the guest experience, the actual budget for nextgen grew to well over twice its original allotment (so they didn't just slash the funds and pocket it for their big executive bonuses like what happens with other budget cuts). I don't even know what the budget has ballooned to at this point, but it began at $800 million and as of early this year it is said to have grown to over $2 billion. It may now be over $2.5 or even $3 billion at this point. Someone like
@marni1971 might know what the current budget is. It may well still be growing considering the tremendous technical issues they were and still are having with the system. But regardless of what elements were cut from the guest experience, the original budget was NOT decreased like other park projects (like New Fantasyland and Rivers of Light). It has grown, well over 2x its original budget at least.
I would hazard a guess that the interactive elements intended for the guest experience were not ever part of the primary budget for next gen in the first place. They were probably budgeted separately. Or at least they couldn't have made up such a significant portion of the budget that their cost was able to add over a billion to the main nextgen budget. Even if they were budgeted in the same pool, I don't buy whatsoever that slashing some very minor interactive features could have possibly covered the $2+ billion cost the main project has ballooned to. Even for Disney's absurd bloat and inflated budgets, I just don't see what would likely have been a lot of poor quality video games in the queues amounting to that sort of cash.