pb4uski
Give me a museum and I'll fill it. (Picasso) Give me a forum ...
USGrant beat me to it. The 2034 and 77% (or thereabout) numbers have been published many places, most importantly in the annual SS trustees report. As to the inevitability of a reduction in payments once the trust fund is depleted, I'd have to find a source, but I'm confident in the information. Look at it this way -- where else would the money come from? They can't just pay it out of general funds.
And just a reminder... if you use opensocialsecurity.com and checked the advanced options, one of the options is whether or not to include a haircut, and if so, beginning when and how much.... so you can see the impact on your benefits and EPV of benefits.