Some investors are thinking Netflix (NFLX) - Get Report should be scared of a mouse.

Shares of Netflix slid nearly 4% on Friday following Walt Disney's (DIS) - Get Reportbig reveal late Thursday of its new online streaming service, Disney+, which some investors and market-watchers feel could cut into Netflix's dominance in the online streaming space.

Netflix stock was down 3..9% to $353.40 in trading on the Nasdaq Stock Market, a day after Disney announced that its new content-streaming service will be cheaper than Netflix's at $6.99 a month vs. Netflix's recent hike to $13 a month for its standard plan. 

While some analysts seem less concerned that competition from Disney+ will be a significant hit to Netflix's business, investors were a bit less sanguine on Friday that Disney's big entrance with a huge library of time-tested content won't disrupt not only Netflix, but also Amazon (AMZN) - Get Report and Apple (AAPL) - Get Report

"There are a lot of other streaming outlets out there," Trip Miller, managing partner of Gullane Capital, a Memphis-based investment firm that touts Disney as a major holding, told Real Money Pro on Thursday. "But I'd say it's Amazon, Disney and Netflix along with satellite cable companies that are really competing. The question of where Apple falls into this picture is something to watch too."

Miller added that if Disney can capitalize on the opportunity it could lead to significant share growth, but was quick to point out the CEO Bob Iger is running a healthy business even outside of the emerging opportunity.

"If Disney completely fumbles this, they'll probably still figure it out in the long term," he told Real Money. "The same goes for Apple and Amazon. But if Netflix gets it wrong, they go to zero."

Shares of Disney soared more than 10% on Friday to $128.60.

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