Idea for the next game's toys: bring back the older gimmicks and release Giants & Swap Skylanders for the light & dark elements among other new figures ( preferably little if any reposes, I'd much rather see more new characters than a 6th Gill Grunt ( 7th if you count Gill Runt )
Gameplay-wise, Skylanders 6 needs to have more of the classic gameplay...and Brock's arena. Have some areas for vehicles ( or maybe have them work like magic items if they decide to make them a one time gimmick? ), but keep the main focus squarely on exploration & combat with element gates & such ( no more randomized collectibles either....I prefer to know where to find specific things, not "here's a crazy slot machine chest...oh, just gold in there...no hat this time " )