With the increasing influence of Bitcoin in the world, more and more people are supporting and approving Bitcoin. Few mainstream media can directly say that Bitcoin is a scam. However, there are still many opinions saying that Bitcoin is a bubble, and this bubble will eventually burst. Many mainstream economists hold this view. They always oppose Bitcoin for different reasons.
You have mentioned the real reason that they oppose bitcoin and that is because they feel it is not felt physically, seen to interact with economic indicators etc but I think the solution to this illusion is to involve Blockchain and cryptocurrency in the academic curriculum for students to start formal study in schools. This will help to diffuse the notion of bubble . The bubble story has been on since the beginning which is a huge critism from the economist.
Not being able to physically feel Bitcoin's existence is a good point if you look from a different perspective. It able to make other didn't know what is your possession in term of money. I rather think it is wholly based on the personal interest about why they look at Bitcoin that way. But I didn't believe they reach that level of ignorance if they based their decision because of it, people just stay behind their own motive, rather embracing the adoption of Bitcoin.