If you can't beat your competition; buy'em
My biggest concern is about the support for legacy Raymarine products via Garmin. I don't think Garmin is a bad company per-se to take over Raymarine; it started by producing military-grade GPS units IIRC. They are a diverse company and the non-marine consumer sector is the "high profile" sector.
The other thread is here:
Garmin to BID on Raymarine