Brendan, is the OP's suggestion as bad as you make it out to be? It might be worthwhile to do as the original poster suggests for a year or two to see how he feels about it instead of paying fees to sell his property and all associated fees/stamp duty etc to buy a new property.
If the current flat/falling market lasted for a couple of years would there be any CGT to pay? I thought it only applied from when you rented the property out not when you purchased it? Your comment on paying income tax on rent would only apply if the interest on mortgage is less than the rent he would get,this may not be the case?
I've thought of doing what the OP suggested and the only thing holding us back is the inconvenience of short, 1 year leases which aren't great if you have family etc.