The above is interesting and no-one else has picked up on it, so I will.
If MW has made a commercial decision to go after one of SPCo's customers contracts directly, in the name of 'competition', and it has subsequently backfired, they cannot suddenly go to the government cap in hand, because they don't like the fall out (i.e. competition). If the above is true, SPCo is completely to blame for the introduction of competition as it has itself created the demand for it from customers who would have previously and for sometime, remained loyal.
And all this worry about what is going to happen with SPCo, if jobs will be lost and passenger services suffer - there is and there will continue to be a demand for a ferry service to and from the Isle of Man. If SPCo can't do it, someone else will. People will not pay exhorbanent rates for ferry travel, therefore in order to make it viable they will offer similar fares to the SPCo, just as airlines offer cheaper fare in advance and more expensive fares at short notice. Thinly veiled threats from the SPCo just don't wash.
In the year to date at September 2010, 545,385 passengers and 150,273 vehicles had travelled through Douglas harbour. I can't see anyone passing up the opportunity to make a profit on that, be it 10, 20 or 30 %. (http://www.gov.im/lib/news/transport/harbours/douglasharbourtr42.xml)