Well just let me disagree with your opinion for a bit
The NW line doesn't really encourage any more sprawl, as there's really no where left to sprawl that wouldn't be developed anyways (there won't be another subdivision build anywhere west of Sarcee for many many years, Rocky Ridge/Royal Oak and Tuscany are all bounded by what will be an impenetrable (to developers) sea of acreages that already exist. Even the current stations in the NE aren't exactly encouraging more development, they're going into already developed areas. If they were to start pushing the line past Saddle Ridge then I would buy into the argument for that area. And in the south most of the area surrounding the south line was already well underway when the extension was built. While some of the new communities further south of the terminus do contribute some ridership, the LRT alone has little influence on their development (I've never seen anyone say they moved to Silverado due to the proximity of the LRT, for that matter the two people I know who live in Silverado drive to downtown daily)
And in terms of suggesting the other extensions should be on a 20 year drawing board, really we're at that point. The extension to Crowfoot according to the city's original plans should have been built in
1982. Not
2009. If it had gone through back in the 80's then it would be more akin to if they decided to start building past Saddle Ridge, but building the line past there to the middle of three established communities with a total population of nearly 5% of the city, isn't encouraging anything. Its reacting to something.
The SE LRT will likely have an initial terminus around Quarry Park from the various plans and discussions people have had at events with the city, mainly as thats the likely minimum distance from downtown as its the only real place they could build the maintenance facilities for the line. There will be a decent amount of TOD like development there, the current component thats been built is essentially offices and retail, the southern half of the project is where the residential components will be and I wouldn't be too surprised to see at least some of those in the next couple years now that the rest is there and open. In some ways QP has actually turned into what was originally envisioned for Crowfoot with a mass of both jobs and retail, and will surpass it when the residential starts.