Well sooner or later we'll have to replace all Type 59s and 69s so doubt that we'll only see VT-5 in Cox's Bazar. India is also working on it's light tank project. I really wish BD could buy Type 12 from Japan instead of MBT-2000.
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Bro, I am not sure what you meant by type 12. You are probably implying type 10 if I am not mistaken, in that case it is bloody expensive. We couldn't afford it back then nor could we now, I think.
Anyway, first and foremost India is developing light tank for for it mountainous border with China to counter PLA.
Secondly, no offense but this map ( I saw it many times before and had the chance to talk about this topic with relevant people ) is out of date and doesn't mean that much. Any modern MBT could effectively operate on most of BD's landscape without seriously compromising tactical mobility or completely getting stuck ( specially those under 60 tons. For example, K2 or VT-4 or Lecrec ) as they have better weight distribution and much more superior power-pack.
You are right that, we are gonna have to replace our type59 and type69 tanks ( probably sometime after 2030 ) but there is no way ( I believe ) we are going to ditch MTB and replace them with light tanks.
I think most probably we will bring VT 4 to replace our relics. ( armed with 125mm smoothbore similar to type59 and type69 )
Or maybe if we are ambitious enough and our economy do good at that time, we may be able to afford a korean or Turkish or a japanese solution.