We do not know what the actual price of tickets are going to be when Disney rolls out the new date-based ticket prices. I would be willing to bet that overall it works out as higher than they are now in majority of cases. I have a rather long memory and none of it can identify any time when Disney rolled out new prices that were on average less than the existing ones, outside of special short-term promo prices that it sometimes created (like it has done on occassion with
DVC AP's).
What concerns me the most is that the info revealed thus far indicates it is eliminating multple-day ticket prices, i.e., where the price per day of the ticket progressively lowers for each additional day resulting in tickets with 5 days costing only $15 more than 4 days and only $10 more per day for the sixth or seventh day. The way the info reads now is that the price of a multiple-day ticket will be the addition of the prices for each single day of the ticket. For example, if you can actually see the price and price calculation shown in that Disney video, it shows an $85 one-day price for a start date in Nov and $334.13 for a four day ticket, which means you will be paying close to $85 for each day. That could mean that for the same period a 7-day non-hopper ticket could cost close to $595, which is $180 more than it costs now. In other words, what you may find if the daily price for each single date you will be there is less than it is now, such as that $85 per day shown in the video, the multiple-day ticket may be less than now for a ticket that is four days or fewer, but will be much higher for 5 days or more. Moreover, it sounds like that if you buy the tickets and then change your dates, you may have to exchange what you have and pay more if the new time you are going is more than the date-based daily prices of the original ticket. Also, you might no longer be able to buy a ticket just before prices go up in the years ahead and then use it for a trip after the prices go up, without paying any increase in prices.
Finally, though AP's have not been mentioned, we have a risk of a huge increase in price in mid-Oct or in early 2019 because Disney usually keeps the AP price for a new AP, starting with the Gold, at an amount that is significantly more than a 9-day hopper ticket, and with an $85 daily price and the extra cost for the hopper, the hopper price for 9 days could be close to $$820.