In my experience if it's difficult to load then you end up using it less. You only need a small excuse to not be bothered going out. Our first Hobie was an Oasis which took some effort to load on my tall 4WD roof racks. Nothing like what a TI would be, which is why I opted for a trailer. We have used our TI a lot more than we did our Oasis.
My AI is easier to load on the roof than the Oasis was. The longer narrower and lighter Adventure hull makes for a quicker load. I carry everything else, ama and aka etc inside the vehicle. With the new ama being 3' longer I'm not sure I'll still be able to carry them inside. Lifting the heavier hull now with built in daggerboard and more plastic will also be more of an effort. So the advantage of not needing a trailer that the AI currently has over the TI will be gone.
Chrisj's point is a good one. If I have to trailer then I'll be taking the TI.
What will be interesting is seeing how the new AI works as a stand alone kayak. If you are not sailing then you don't need the built in daggerboard. Used in kayak mode the current Adventure is a dry enough ride as is so the extra height and bulk/weight are not really wanted in a stand alone kayak.
I wonder if Hobie are keeping the old Adventure hull for kayak sales and going the same route as the TI with the new AI available only as an Island?
What I find ironic in all this is that Hobie have gone to a lot of effort in developing an improved AI that addresses the shortcomings of the previous model like nose diving, wet ride, sitting in a puddle etc.... that disappeared if you added Haka and began hiking out. I don't need longer ama if I'm out on the haka.
A larger sail is welcome but it's extra power can be handled simply by hiking out on Haka which are the best accessory the Islands have seen and yet still not available from Hobie!