Pretty safe to say no one really knows what will happen when Sinclair buys Fisher. It is fair to assume they will trim all operations since they need a return on their investment. They appear, from all indications, to be a fairly low budget operator that creates high margins. Not atypical in today's broadcast environment.
As for radio, I can't see why they would keep it, unless it supports the TV agenda. I wonder if they keep KOMO and KVI since they are integrated into the TV news operation sharing reporters and talent. KPLZ seems the odd station out and would have high value moving to any radio cluster in Seattle. The station is number one in women, top three in adults and a top to revenue generating machine with the heritage currently number one ranked morning show in adults. I would guess Sinclair could sell it for a nice profit, the other two stations certainly support TV and would not generate much value in a sale as AM sticks tied to the KOMO news operation.
As for going from one song to another, that is due to PPM. Every station does that anywhere in the country in PPM markets. Since signals are encoded there is no longer a need to put imaging inbetween each song to remind/annoy listeners of what station they are listening to. Turns out just great music, back to back, mixed with personality wins. I was in Dallas last week and KISS there played six songs back to back before talking. I actually find that refreshing. I do think stations that have no personality are missing the PPM point though. Look who wins in every market in music radio. (KISW, KPLZ, KZOK currently here) Local personalities mixed with long sets of uninterupted music.