Some math (numbers from here: http://community.wizards.com/forum/m...hreads/3944651 ). Let's say a deck has 24 resources in it with the current system. There's a 30.8% chance of getting 3 resources. There's a 2.1% chance of no resources and a 12.1% chance of 1 resource (both of which you are probably going to mull).

Now let's say you get a free mull with 0 or 7 resources. You decide to drop to 20 resources in your deck. Now you have a 26.9% chance of 3 resources in your starting hand. There's a 4.8% chance of no resources (just over double the previous chance for a free mull) and a 19.8% chance of only 1 land.

You've decreased your chances at getting 3 resources by about 4%. You've also increased your chances of a 1 land hand by almost 8%. Meanwhile you've only increased your chances at a free mull by 2%. Is it really worth it to run less resources? You've also made it so that running a hand with less than 3 resources is more dangerous because you have even less chance to draw into them.