There are definitely still room for Hisilicon to win market share in.
For example this new large MiniLED TV from Hisense uses Mediatek's MT9653 SoC. Huawei isn't going to win the entire market, but if production comes up more, it can win more of the market and leave less for Mediatek, qcom and others. All of this helps domestic industries
Huawei does have its own TV aka "Smart Screen" so other TV makers might be relucent to use Huawei SoC. Rockchip is another domestic (mainland) alternative to Mediatek. Tencent has switched to Rockchip from Mediatek for its latest TV box.
What's equally important is to push for domestic media standards. There's no reason to pay to use Dolby Vision when Chinese audience almost exclusively watch Chinese program on Chinese SVOD. Use domestic HDR standard instead. Tencent's Rockchip-based TV box supports domestic HDR but not Dolby Vision.