Are most sectors long enough for people to worry about stuff like leg room? Jet Blue's 32" in the front half, and 34" behind is interesting in this respect.
If people want lounges, they can easily pay separately for them through various programmes - and "PAYG" type access is becoming more commonplace too.
Personally, I think the whole "get on and off as quick as possible" is over-hyped. I'd always rather sit back in the departure lounge, or stay in my seat, and wait until the scrum has died down! But I can see why most people prefer it the other way, and don't think it is in the airline's interest to encourage people to wait behind!
Then again, anything which increases revenue with a minimal downside has to be worth trying for all LCCs.