USCIS will not stop paying its employees... Rather USCIS will find "cost savings" in failing to actually work in a reasonable time frame on the cases that are submitted for review. 

How bad could this be? We don't know yet. 

However USCIS is now quoting that an Employment Authorization Document that took 45-90 days to process prior to Trump for legally working in the US will now take approximately 28.5 MONTHS to 37 MONTHS to be produced.... and on October 2 you will even need to pay extra for this application....

This begs the question. Is US immigration even open for business if you need to wait three [3] years for a work card to begin working? 

The Trump Administration's message here is clear. If you want to end all legal immigration to the US vote for Trump in 2020. The best and the brightest will move away, and the good jobs will follow them out of the US.

With four more years of Trump, US workers will begin immigrating elsewhere for jobs and opportunity as large corporations will see no need to staff in such an inhospitable, anti-international, and hateful climate. 

Bottom line for now: we can expect delays in every facet of immigration processing, and if Trump is re-elected in November....

USCIS, in yet another legal loss for its unconscionable conduct during the Trump Administration and during the pandemic, was forced by the courts to agree to expand the evidence for proof or employment eligibility based on USCIS's failure to timely print and mail out EAD cards after their approval.

As a result, employees may use Form I-797, Notice of Action, with a Notice date on or after December 1, 2019 just as they would an EAD card. 

Employees may present their Form I-797 Notice of Action showing approval of their I-765 application as a list C document for Form I-9 compliance until at least December 1, 2020.

See this update on I-9 Central https://www.uscis.gov/i-9-central/form-i-9-verification-during-ead-production-delays-due-to-covid-19:

The Trump Administration has significantly changed the USCIS fee schedule by adjusting fees by a weighted average increase of 20 percent, adding new fees, establishing multiple fees for nonimmigrant worker petitions, and limiting the number of beneficiaries for certain forms.

The rule is effective 10/2/20. Any application, petition, or request postmarked on or after this date must be accompanied with the fees established by this final rule. (85 FR 46788, 8/3/20)

In addition to adjusting fees, the final rule removes certain fee exemptions, limits fee waivers, alters premium processing time limits, and modifies certain intercountry adoption processing.

Some of USCIS’s forms will change. USCIS will post the new and revised forms online 30 days before the new rule goes into effect. These forms include:

• Form I-129, Petition for a Nonimmigrant Worker;
• Form I-600/I-600A, Supplement 3, Request for Action on Approved Form I-600/I-600A;
• Form I-765, Application for Employment Authorization; and
• Form I-912, Request for a Fee Waiver.

USCIS will provide a grace period of up to 60 days in which it will accept both the previous and the new versions of certain forms as long as payment of the new, correct fees accompanies the forms. Applicants and petitioners must use the new or revised form by Oct. 2, 2020.