The law won't go into effect until at least February, and for the vast majority of people the effect won't really be felt until their March paychecks, and their 2018 tax returns. Pretty much any family with itemized deductions of less than $28,000
To put that in perspective, 71% of all filings in 2014 opted for the standard deduction, those refunds would, by default, be higher under the new plan than the old plan. Of all filings that did itemize their deductions, the average was $26,374... so it can probably be assumed that the majority of those who used the itemized deduction in 2014 will likely only need the standard deduction in 2018. Granted, that depends on the number of filers in that group who are families with at least two kids... but if we assume only 30% of those filing itemized deductions are families of 4+, that would still mean that a minimum of 80% of all filers will see a higher refund in 2018, or higher net pay in their paychecks.
Compare that to the poll in the OP that asks: "Q19. From what you know of those proposals, do you think you and your family will be better off, worse off, or about the same if they are passed and signed into law?"
... to which only 21% believed they would be better off. Do 79% of those polled not care about money, or are they just grossly misinformed?