YES! Exactly this! Pick 3 headliners and make them ILL, put everything else on G+ and drop the price of G+ to make up for the fact that the main headliners aren't on there. This will reduce the buyer's remorse aspect of paying for G+ without getting your money's worth and for those who want to buy an ILL there's less chance of being disappointed since you can pick your exact time and have more control over planning out your day. This also furthers the benefit for on-site guests rather than diminishing it. Seriously, this isn't that hard and yet here we are.
Not a fan of the idea of them charging even more to go on the rides in the park that we've paid a huge admission to already.
I'm happy about them adding more rides to the G+ pool because we weren't going to buy all of the ILL anyway, due to the cost but also mostly the principle of having to pay even more to go on rides. Adding frozen to the G+ line up makes me reconsider getting G+, since we weren't going to get it for Epcot since there aren't that many rides anyway and while it'd be nice to go on Frozen, we can live without it.
The other 2nd ILLS that they made G+ were rides we weren't going to buy anyway, so adding them to G+ could work out better if we are able to get enough selections.
I think there are a lot of ways to make G+ better, charging even more/making more rides ILL$ doesn't sound like a good answer to me. They will still have all of the angry people who can't get anything since it sold out, or they will keep you limited to 2 purchases per day to leave inventory for other people.
G+ biggest problem is that it costs money. If it were free, people wouldn't be so quick to complain that they didn't get many rides.... A modify/choice of times would help a ton or selecting things ahead of 7am... but just charging for more rides will make it worse.