I am doing the AP thing .. but my gamble is probably not going to pay off.
I have been planning a Nov. 2018 - Nov. 2019 AP year to hit TSL this fall and SWGE next fall, but all accounts it probably won't open until December .. so my gamble is not going to pay off, but I will still enjoy several trips pre-SWGE.
Technically I haven't bought the AP yet as I want to upgrade some 5-day tickets to an AP (so hopefully any price increase doesn't affect those), but I am probably still going to get the AP .. just due to all the discounts I've gotten thus far on our hotel.
So rather than trying to buy tickets NOW to save some money and hopefully have a SWGE trip booked, just make some budget cuts (to the trip .. or your lifestyle) to save up the difference between the current ticket prices and the new ticket prices. Hopefully price increases won't be THAT much -- but if they are Disney is really going to shift some people's plans (go less, go at different times, etc.).
Though, if they are going to tiered pricing .. I can easily see an "opening week" tiering price bump when SWGE opens.