WASHINGTON, Dec. 29 -- With Obamacare going into full effect on Jan. 1, more glitches are expected for President Barack Obama' s embattled healthcare overhaul, although the scope of the problem remains to be seen, U.S. experts said Sunday.

Obama's healthcare rollout, also known as Obamacare, has faced myriad hurdles since the Oct. 1 launch of its website healthcare.gov, through which potential buyers were supposed to be able to choose from various healthcare plans but instead faced a labyrinth technical glitches.

To add to Obama's healthcare woes, recent polls have found that Americans are overwhelmingly uneasy about the new healthcare law, believing it will lead to higher premiums and deductibles.

Anger is also mounting among an estimated 4 million Americans who have been dumped by their insurance providers, as their plans failed to meet Obamacare's new guidelines. That development came after repeated promises from Obama that those who liked their insurance plans could keep them.

Some experts said more problems will follow when Obamacare is fully implemented on Jan. 1, as many who signed up for plans under the healthcare revision in recent weeks could see processing delays and may not yet be able to use their benefits.

Scott Gottlieb, resident fellow at the American Enterprise Institute, told Fox News Sunday that some people who thought they had signed up for Obamacare will not be able to access healthcare.

He added that some plans offered under Obamacare do not cover treatment by specialists, and patients may have to travel up to 50 miles to see a specialist in their coverage network.

Indeed, one plan in Florida had a mere seven pediatricians for an entire county, Gottlieb said.

"There' s not a lot of specialists under a lot of these plans," he told host Chris Wallace.

There may also be problems accessing prescription drugs, as not all drugs will be covered under all insurance plans, he said.

But former Vermont Governor Howard Dean told Wallace the new healthcare laws will see some problems, although overall he expressed optimism that the system can work through them.

"I think it will work," he said of Obamacare. While he acknowledged there will be some problems, he said he believed they would not be insurmountable.

The administration tagged the latest number of Obamacare enrollees at 1.1 million, although the figure is likely to fall short of earlier White House projections that 3.3 million people would be signed up by the end of the year.

Gottlieb said many of those covered under Obamacare had been forced off their previous plans, and they are going to find their new Obamacare plans more expensive than their previous plans.