Yeah, I was thinking about that. If you commute to work via public transport and use your MBP on the go then a MM isn't an alternative. However if you travel by car you cannot use the MBP on the go anyway. I currently use an Intel Compute Stick as 'mobile laptop'. There are tons of other (more capable) devices out there which could do the trick however I use it together with a HHKB and an Apple Magic Trackpad 2. Both of which are also usable together with a tablet or smartphone. Monitor-wise I'm roaming, but I've seen some neat 720p and 1080p screens. Even touchscreens.