I don't think for a second that Novitzky was twiddling his thumbs for 2 years. I am sure that Armstrong and his associates have made some mistakes and enemies along the way to amassing  bike racing records and huge sums of cash while doing it. 
I have always been upset about the trashing of everybody else like the race directors,race officials, team staff, sponsors.police, federation employees,police,officers of the court. 
Everyone of them assumed to be in either collusion or at the very least complicit as Armstrong went on a 20 year crime spree. Armstrong is in an all win position now,the suspected misdeeds happened off shore 10 years ago, when he hoodwinked the business of pro bike racing. As an American he can feel pretty comfortable about a few things.
The majority of the English speaking population don't care about him now and they really really don't care if a teaspoon of people think he cheated at bike racing 10 years ago.
The majority of the US population will see that the FBI thought this was not worth their time. Armstrong, the population and the FBI will see that after Bonds, Clemens and Armstrong the record is completely fvcked at best. 
Bonds avoided everything. His case was reduced 3 times and even after reductions in charges and dismissal of others the feds got him on a procedural offense that has him wearing an ankle bracelet while at his mansion.
The government spent nowhere near the time and money on Clemens but another public disaster. The top cop disregarded the judges orders and Clemens walked out and the federal government was left holding their sack and an empty bag of money they wasted trying to convict him.
If the feds have records that show that race officials let Lance win by cheating it must not have been too awful private. If the feds have records that airport security let Lance walk thru w bags of drugs 10 years ago as claimed, what record keeping those Swiss and Austrians have, congrats.
If Lance has been in a locked in a long kiss w somebody at the IRS that has allowed him to slurp millions out of bank accounts, not without detection but with permission,omfg, the boy is a god.
When are all the people that have been treated like legal lily pads in this going to get a sorry, probably never.
If some other government or quasi gov agency takes this on they will ruin themselves. If you put your real name on anything that says that convicting Lance Armstrong for his cycling crimes is or should be a top priority for the government you are probably going to a camp ground at area 51 or at the very least a Rick Astley concert