Seeing as I've spent no EP yet that would be good for me but I don't think it's a good idea.

People will refuse to spend any EP at all because doing so would lower their EP generation and thus make them worse in the future.

On top of that let's say I don't spend any EP for a whole year. How much would I gain in a single day? Eventually people would be able to buy every skill from a single week of EP generation. And if the devs add more skills to make that impossible then the people who spend EP as they needed it will be way behind.