The 737 flying out of Houston has changed. More and more of that flying that was serviced by the 737 is now on the Airbus. Did you miss all of the vacancy bids with IAH 320 positions. If they increased the Airbus by almost 200 pilots over the last few bids what did you think would happen on 737? Displacements suck! When it's not your seat you can see clearly the need for them....but when it your seat or a city you want to based it seems like madness (I am hoping to be based in IAH)
On a side note there is absolutely no benefit to UAL management to move seats out so L UAL pilots can then bid them. That would cost a ton of money and when the share holders find out (you know the people our co workers in Chicago have fudicary responsibility to) they will call for people's heads and if the sum is large enough to push the stock price down during a share buyback program it could land them in court.