They can borrow (HELOC) style on multiple properties in a combined/blanket loan to easily access cash for another purchase. 

The better way to think of it is that you will have to buy better deals or create more value so that your cashflow will be same or better than prior.Plus portfolio/commercial loans can package multiple loans together too so you can do 5 BRRR's at one time and cash out refinance as soon as you get a lease agreement with a "blanket," loan that ties together 5 trust deeds/properties into one mortgage.

Could you find a lender who can do a blanket mortgage with your existing properties, and this new portfolio?

The "D" rating is a blanket statement and yes, the schools are 3/10 but it's not a war zone. 

Shades or blinds should be used, not blankets.

Have you looked into blanket loans? 

Even though It may not meet your definition of "rich" at this point in my life it is working for me and I am getting an education in my choice to build wealth.If you cannot add any constructive advice or give examples of what you mean, then stop with your blanket statements.I am not trying in any way to discount your right to your opinion, its just we need more information behind it.

I am not sure there is anything that can do that.I am sure @Joe Splitrock has a ton of experience, but I would just rather not be subjected to rude and offensive posts from people who do not have the decency or respect to communicate without making blanket assumptions.  

On my policy each house has a lower liability rate and I have a blanket liability policy that covers all my properties.

Making a blanket statement based on someone else's singular experience is unwise.