Unless Blashill's replaced in the offseason, I don't see where a midseason coaching change is going to rectify some of the complaints in here. That and Bylsma should NOT be a solution unless it's as interim guy destined to be replaced.
Usually a mid season coaching change sees the new coach really tighten down on defensive hockey to glean out some initial wins. If you think Blashill is "low event", you probably aren't going to like who ever replaces him mid-season.
Anytime I see Bylsma presented as an option, I cringe. The guy took over a stacked team later in a season and won a Cup, then massively underachieved for years. Then was a trainwreck in Buffalo. He also represented a point in time where the Pens were AWFUL when it came to developing young players, while he insisted on dressing more than one guy most nights that made Justin Abdelkader look like Teemu Selanne like Craig Adams and Tanner Glass. If you love seeing Abdelkader in the top 6, then you'll probably love Dan Bylsma as a head coach...
Unless the wheels really come off this next year, I'm fine sticking with Blashill going forward. Given where this teams at, they need to develop young players and maintain some sort of competitive culture. Despite all the complaints and whining about ice time and running off studs like Teemu Pulkkinen and Tomas Jurco, it seems to be happening. Interestingly, most of the guys that have debuted at the NHL level under Blashill (and thus contain only his fingerprints), had some sort of expected future upside and have now played multiple seasons at the NHL level have all seen some measureable improvement. That includes Larkin, Mantha, AA and Bertuzzi and we also saw Nick Jensen go from almost forgotten organizational depth to being one of their better dmen last season. Save for Mrazek, a lot of the young guys that didn't pan out under Blashill had already started to trend down under Babcock, or weren't projected to make any sort of major impact at the NHL level anyway. If we see Hronek and some other guys make strides next season, then Blashill is doing just fine.