At $7K it's not a very good idea. I suppose it depends how much that amount of money means to you. For me, the $3K deal I got during the fire sale last year was right for me because I intend to keep my Model 3 for 8-10 years, as that is how I am with cars. And if I did need to sell the car, it helps with the resell value. I'd recommend to anyone keeping the car for a few years to grab it during another fire sale for these reasons, but the $7K+ is ridiculous.
Also I'm not impressed at all with the rate of progress on this, mostly because of all the false hope Elon gives about the release of "feature complete". So much for 2019, that was a fib. The only FSD feature I use consistently is the turn signal stalk to change lanes. I don't trust it to take most ramps automagically.
I think FSD is worth $3k today. I don’t think it is worth investing in vaporware at $7k. Maybe if the speed increases and nav unit data plan were included with the $7k, but as it stands you will have to pay thousands more for those upgrades. All that cost on a depreciating asset that many don’t hold onto for more than a few years. Tesla, stop smoking crack with this pricing!