In answer to your question about breaking 10 for 2 miles. The answer is probably "NO." Not if you were running 6:05 as a freshman.
The problem is we don't know much about you. Efficiency, gait, build, cardiovascular fitness, mental fortitude: these are all factors that play in here. How much yearly volume do you have at this stage of the game? How dedicated are you? Where do you live?
Yes, there are many good runners on this board who could run sub 10 on very little training. But they aren't you. And what rules apply to them do not apply to you.
Most of the advice on this thread is very good. Gradually build up to 60 to 70 and hold that for as long as you can. If the highest mileage you've ever had is 40, then you have a lot to learn about running and sustaining decent mileage. If you shoot for 100 MPW, your chances of: injury, fatigue, frustration and burn-out increase exponentially. I'd say it increases with every mile past 50 per week. So 60-70 is aggressive enough already.
It is a pretty good bet to assume that given a fairly aggressive increase in volume, you will become a much better runner. How much? Who knows really. It just best to say better.
The key will be rest and recovery. If you beat yourself into the ground all winter, you will be sadly disappointed in track when you're too tired to even run a workout.
Focus on "volume," mix in long runs and tempo work when you feel like it. Maybe one long run a week, tempo every other. Tempo isn't as important as maintaining volume.
Miles of trials, trials of miles...
The Wagon