The idea of constructing a national highway system of sorts for the mortgage market by merging the GSEs into one has been making its rounds in the industry this week. And there’s been some dispute as to whether the plan is feasible. Five mortgage industry veterans – including two who worked in the Obama White House – floated the new plan aimed at preserving the government guaranty on conventional mortgage-backed securuties and finally ending the uncertainly plaguing the secondary market. Tim Howard, former Fannie CFO who left the GSE in 2004 and was involved in litigation regarding his tenure there, said the authors “greatly underplay the dangers of making a $10 trillion market...