Mike Rutter was on the radio the other evening saying the he'd expect IOM-LGW to go over to the E175, but didn't say when.
As a regular pax on the route it will be very welcome and will probably have sufficient appeal to draw some business traffic back from RE and LCY and fill those extra seats.
Only downside I can see is that having 4 interchangeable Q400's based has given operational flexibility and enabled the daily IOM programme to run on a very reliable basis.
This has been a big improvement from the days when a 146 ploughed back and forth to LGW four times and was quite often significantly behind schedule by the end of the day. Not much fun for day trip pax getting back to Ronaldsway at 10.30pm, after starting from home at 5.30am. Not to mention the cost of late airport opening for the operator.
So provided there isn't a punctuality trade off, bring it on!