So based on marketcap can bitcoin double its marketcap in short time to $2 trillion resulting in $100k per btc this year?
Quite possibly. Institutional investment does seem to be the main driver of the current bull run. It may reach a point where people start to think it would be foolish not to have a small bitcoin position.
A 'small' allocation in percentage terms for a growing number of large institutions can have a significant impact on price.
Also 1 trillion to 2 trillion is of course not the same as zero to 1 trillion. If you look at bitcoin price history on a linear scale chart, you learn very little. If you view the data logarithmically, then clear patterns emerge.
Finally, bitcoin is not a company, so there's no sense saying it's "as big as Microsoft" or "as big as Amazon". If bitcoin is a currency, or if bitcoin is a store of value, then 2 trillion is not a problem.
The flip side of all this, of course, is that prices can also fall. Steady increases in general are good, sudden huge increases are much less sustainable.