The phrase "are likely to conclude" is correct and usable in written English.
It can be used when discussing probable outcomes or deductions based on evidence or reasoning.
Example: "After reviewing the data, researchers are likely to conclude that the new treatment is effective."
Alternatives: "are expected to determine" or "are inclined to infer".
Many Tory backbenchers are likely to conclude, like the predecessors 90 years ago, that they no longer need to cosy up to the Lib Dems; and Lib Dem activists who feel queasy about their relationship with the Tories will urge the party leadership to end it well before the next general election.
When a not-so-careful writer tries to gussy up his prose with an upmarket word that he mistakenly thinks is a synonym of a common one, like simplistic for simple or fulsome for full, his readers are likely to conclude the worst: that he has paid little attention to what he has read, is affecting an air of sophistication on the cheap, and is polluting a common resource.
Few readers of these sentences are likely to conclude that such a volume represents "careless polemics".
You are likely to conclude that SmartKey is definitely a package worth looking into.
Analysts are likely to conclude that the deal is better for ICE than for its partner.
Many more are likely to conclude that the demise of mob rule over the Nevada gambling industry was greatly exaggerated.
If you simply nod like a bobble-head doll, the interviewer is likely to conclude that you have nothing to say or you're not interested in the job.
"Who knows?", a reporter on a tight deadline is likely to conclude.
She found that game users would not be likely to conclude that Brown had endorsed the Madden NFL product.
Israel would be likely to conclude, in such a case, that the only option left was military.
Even the most careful economic analysis is likely to conclude that uncontrollable factors play a major role.
