I think the blue essence in general needs to be distributed in other ways than just the off chance of getting a champion shard from hextech. 500 is quite a steep price as well for simply unlocking lv 6 for even one champion.
Tbh, I think it would be swell if blue essence could be distributed via a method similar to the free win of the day so it encourages more players to log in more often. Even a small amount such as 50 essence a day (just an example in regards to getting enough essence within 10 days of logging in for 500 essence) would be easier than simply crossing one's fingers for an actual champion shard to disenchant just for the mere starvation of levelling up a champion.
Don't get me wrong, I still do believe 500 is quite a steep price for levelling up; however, like what the topic says - we really need more ways of obtaining blue essence than just hoping luck gives us a champion shard to disenchant.