Seeing that shot of them in the plastic tray, it makes me wonder why Hot Toys doesn't just sell popular characters by their lonesome and keep them in a yearly distribution. Keep up the supply and demand of favorites/best sellers like Batman, Iron Man, Original Predator, etc. with a bare bones set that is nothing more than the main figure, hands, an accessory or two and a standard base in a simple box for about $230.
Basically, just this,
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And keep them in constant rotation. It could be like a sub line like MMS: Classics. Just take their best selling figures and sell then without gimmicks, a lot of weapons, packs, exclusives, fancy packaging etc. Do it with Iron Man, Batman, Joker, any character that's popular. They'd surely profit considering there's always a need for those characters. They have no qualms about repaints, redos, or what have you, so why not. I bet it'd be more successful than their diorama or "compact series". It'd also combat recasting and secondary market issues.