I DO include an automatic HOLD OVER rate to encourage tenants to sign a 1-year lease extension addendum and not remain on MTM indefinitely.

Assuming each house is cash flow positive with 100% financing, you could buy an indefinite number of homes, each of which make payments to you.Where is the advantage I am missing here??

They buy what worked and they expect it's going to continue indefinitely.

All allow you to continue your tax deferral indefinitely and still access your allowable depreciation. 

., and its allies have argued that a temporary expensing regime does not provide an equal benefit, and results in a tax cliff at the end of the five-year period.The use of Section 1031 like-kind exchanges to defer taxes indefinitely, and the possibility to eventually escape taxation, is also mentioned in the explanation.Republicans Set Aggressive Tentative Schedule, Aim for ThanksgivingThe proposed schedule to move the bill through the legislative process, updated this week, is as follows:Week of November 6: Markup in the House Ways & Means Committee.Week of November 13: House Floor consideration of the tax reform bill. / Markup (tentative) in the Senate Finance Committee.November 17 - December 24: Passage of tax reform bill targeted for as early as the Thanksgiving recess (November 17) or as late as Christmas Eve.The goal of the White House and Republican leadership is to have a tax reform bill signed into law within the next 3 to 8 weeks.If the bill is passed into law:December 31, 2017: Deadline to complete sale/acquisition of either relinquished or replacement property, in order to qualify for treatment of Section 1031.January 1, 2018: Modifications to Section 1031 become effective.The legislative schedule is aggressive.

The $250 per month will kill your cash flow indefinitely.

It may work a couple times, but you can't do it indefinitely before you have to start paying them off.I also think the BRRRR strategy is a bit over rated and it's more difficult in practice to get all your money out, especially with the prices of homes today.

Should I even forgive the rent or should I wait the indefinite amount of time until the courts open again?

You will need to do a 1031 exchange which will defer indefinitely the tax on gain and depreciation recapture.  

I would not recommend doing this approach indefinitely, u need to true it up on annual basis, for this u can look at sales of similar properties on Zillow and also compare to the zestimate and then do a true up.I don’t update my balance sheet for appreciation monthly, only annually.