Chasing #1 Test Spot but can India hold on to it?

The media in India is going crazy with the fact that if India can win the last of the test matches against Sri Lanka, they would occupy the number one test ranking for perhaps the first time since the official ranking system was launched. However, one question begs to be asked - unlike the Aussies who turned out to be absolute rulers as the number one ranked test team, can India actually hold-on to the spot for a substantial period of time?
Their middle-order might be one of the best in the world right now, but a few seasons from now on and some of the big names are bound to retire. Where are the worthy replacements? Where are young, tear-away fast bowlers who can win test matches on their own? Even Bhajji has no one who can be called his ally in terms of a dependable, back-up spinner. I honestly believe, we are reading too much into the ranking updates. Let us get real, the points will come and go but the real test is of the fact that whether a team can be heads-and-shoulders above its immediate competition.

Looking good now, where are the replacements?

The Indian middle order looks pretty good right now with Tendulkar, Dravid and Laxman still pretty capable of winning matches on their own, but just looking at the future, are there any replacements for these Big 3? I mean, Australia had a horrid year trying to recreate their batting order once some stalwarts retired and it seems that India could be headed for something similar. Apart from Badrinath and Pujara, there are no names in the domestic circuit that are supposed to combine technical batting good enough to play really fast bowlers with a huge appetite for runs and then again, Badri has not found favor with the selectors and Pujara is often regarded as a scorcher off spinners and slow bowlers and not-so-good when the quick bowlers are on.