When I had DSLR's I wasn't happy with the bulk and weight over film SLR's and the attention you sometimes get when using big and obvious kit so MFT was interesting as it's smaller, lighter and less intrusive and obvious and attention grabbing to others when you're out and about. Even with a 50mm mounted my DSLR's were still bricks. So, for me it was want and need as I wasn't really happy taking the big honking DSLR kit out. You'll have to make your own mind up if this is a want or a need
These days I don't use MFT much, mainly the GX80 and 45-150mm, these days I prefer my FF Sony A7 and a compact prime and the GX80+45-150mm or A7 and Panasonic TZ100.
If you go MFT I wouldn't worry too much about the Olympus take over as the relationships between the companies are complex and just about unfathomable as they often are with Japanese companies and Olympus is still in the mix there somewhere. Having said that I always preferred Panasonic because of the more anonymous styling rather than the more obvious and retro styled Olympus cameras.
One thing I would recommend is thinking about looking at used lenses as there seems to be a healthy trade in them and some can be found at reasonable prices. Most of my lenses were bought used and I've been happy with them all.