There are few other things that depends on the success of VB. It's definitely good that such high speed trains are introduced but we have to find out whether people can afford it or not.

In TVC - CAN section mostly and mainly during the morning hours the proportion of office-goers are higher than in any section. Compared to TVC - SBC section which caters to a vast amount of students, techies and businessmen... TVC - CAN section mainly caters to office-goers and others.
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First point is Fare... As we all know roughly the minimal fare of VB is 10 times more than the minimal fare of JS. I have explained about the importance of CLT JS earlier.

I believe in other nations the income - expenditure disparity is less compared to our nation. That means even though the services are expensive people can afford it. But here prices of petrol and basic commodities increases on a day-to-day basis even though it's for development. But we need to note that the increase in income of people as compared to the increase in expenditure for basic commodities is not happening. So even when the price of basic commodities increases, the income of people remains the same or there is no hike based on the above said. This decreases the purchasing power and affordability of people.

Kerala having said a region which has more middle class population

Let's see for a daily commuter in JS let's keep the number of working days as 20. Let the minimal fare of JS be 100 and minimal fare of VB be 1000. A normal office- goer who travels to and fro will have to pay

JS - 20 x 200 = 4000
VB - 20 x 2000 = 40,000

A private sector employee who gets an average salary of 30k Or 40k will find it hard to travel in VB, even for govt employees who get a salary of 1 lakh mostly won't be entertained to spend 40% of their salary for just a day-to-day travel. ( I'm telling about the majority crowd in the sector which is office-goers). So even when the fare is high it should have more benefits mainly increased speed and secondly facilities which is already there.

The second point is feasibility in terms of line availability. Introducing a VB in Kerala should not be like immersing a ship in a small pond. Here when you do it the basic use of the ship is lost. So inorder to use the ship effectively either a bigger pond which can accomadate the ship must be built or else the existing pond should be converted to a much bigger one. This is the exact same thing that needs to be done in the case of VB..... When VB is introduced line capacity, speed should be improved or else alternate lines should be provided which I feel the secondary option is important as when more and more trains are introduced in an already busy line the congestion will be increasing within a short period again(We need to note that the existing lines are used by super crawlers) . The permanent way out is definitely newer alternative lines.