Not even close. The implications of striking down Section 4 are immediate and drastic--the total inoperability of Section 5 that relies on Sec. 4 to establish which states must submit to Sec. 5 preclearance.
Without an amendment from Congress, which seems unlikely in the House, the most successful piece of legislation in American history will be destroyed. And it took Texas a whole day to start rolling back protections. This is EXACTLY why preclearance was so necessary to begin with.