What does the future hold in store for the alternative mortgage market? It’s hard to tell, because the story of 2006 will depend on a number of different variables – including the zest with which regulators pursue an apparent crackdown on nontraditional loan types. Clearly, 2005 was a banner year for the alternative mortgage sector, as borrowers flocked to interest-only loans, option ARMs, and later in the year, 40-year mortgages, as a way to…