There are no walls.
I'll repeat: there are no walls. If you see any, it's all in your mind. Every Pentax equipment's limitation is not a wall completely preventing you to do a certain task, and then as Pentax improves, fully disappearing. There is no hard limit between Pentax being "successful" and "failing". There is no "they only have to fix this and this, and all would be well". That would imply some sort of a silver bullet, and
there's none
I'm Pentaxian since before the digital; I've witnessed their slow start with the *istD, and all the improvements and hiccups. I've seen all sorts of complaints, some of them becoming irrelevant in the years after (e.g. image quality), some much improved.
Every step forward would open new possibilities; the K-1 being their first FF DSLR - that was huge, the 150-450 is a very good "wildlife" lens, the 70-200 as their most ambitious lens in a while. Every such step allows us to do more, better.
So would an improved AF, for example. It doesn't have to be the best; it doesn't have to beat or even equal the competition. Just by being improved, more of us would think it's "adequate" for our needs.