I would think releasing 5-7 max is the tipping point. Most of the mps release are not actually new anyway, and are repaints and hence why people are feeling bored.

Magnus, Wheeljack, Bumblebee were what I liked. Skywarp, green/purple prime, gold megatron are not what I be considering as a release.

Starsaber would be something for me to look forward to than mp Exhaust.