Some good reading here guys and lots of valid points.
Unfortunately for the stock classes to become an even field requires all drivers to run the same equipment etc.. which I dont see happening here. RC racing is just that... and like drivers manufacturers will always try to out do each other with faster products as what was mentioned here already, consumers nightmare, retailers dream (true way to put it) and we still buy, not only to be able to be at the pointy end but to push the boundaries of what these cars and classes are capable of, and the technology..its intriguing how far they can go, its one of the reasons Im still racing as it never gets boring and always a challenge.
Im quite enjoying the current speed of 10.5 and it will only get quicker as its now become a smaller step to mod, hell at some tracks were just as quick.
The last jump in speed came from weight reduction...ok so 75g isnt much but weather its wight esc's, motors or lipos something quicker is always around the corner.
I do believe though nothing of the above will help unless your super consistent as 1 fast lap doesnt get you a decent place on the grid nor wins races, if anything a slower car could be faster for you to first gain that consistency.

For those deciding on what speedie to get or want an upgrade...I'll rephrase that...need an upgrade and arent sure what to get, find out what the fast guys are running at your track, these guys can also help and assist you with setups as well.