I have for years given HSBI shares as rewards for contests, and currently sponsor a weekly share for the Ecency most active (previously, I did so for the Engage most active), so I've got a lot of shares. The price of Hive being higher would not effect me doing this, because I'd still be receiving upvotes and payouts for delegating and curation rewards etc. in Hive, not dollars. So like, I delegate to DIY, and currently receive I think it's about 1.8 Hive per week in delegation rewards. I would still receive 1.8 Hive whether Hive is 50 cents or 5 dollars. So I could still spend that 1 Hive on the Ecency list to send a share even if I hadn't posted anything at all.
The only way I could see this effecting the likelihood of people buying shares is if people want to cash out while the price is high, so they aren't investing anymore in anything. But even when I've had to cash out some recently to pay bills, I was still sponsoring shares.
This scaling with the HIVE price is how it's supposed to work. The dampening effects mentioned in the post are minimal and temporary.