To some extent, but IMHO, most people realize that one doesn't have to love a candidate in order to vote for a platform espoused by a candidate, so whether they "love him or hate him", they'll vote for the vision, policies and strategies of PDJT's platform. As such, PDJT already has more far more than enough votes from member of all parties to win.

Some disgruntled Republicans might defect to RFK, Jr. if they can stomach his traditional Democrat stances (social welfare, abortion, gun control), out of pissy-ness because he's "not Trump", because he's overtly anti-jab or for some other reason, but that number will not be significant.

Dems have A LOT to be unhappy about re: the party's extreme radicalization toward socialism/Marxism/facism/communism and its "antics" (Buydan's "covered-up" dementia, Kameltoe being complicit in the cover-up FOR YEARS, Buydan being the only Dem candidate in most primaries, having Kameltoe/Walz shoved down their throats without a "real" vote, SS denial to RFK Jr., demonization of RFK, Jr., etc.)

RFK, Jr. is "Dem-light" - more traditional (70's through early 2000's) Dem policies (social welfare, abortion, gun control). As such, he SHOULD be THE choice for disgruntled Dems who don't want to leave the "Dem farm", but cannot bring themselves to vote for the craziness and radicalization espoused by the current Dem party and whomever it eventually puts on the ballot. Their number could be significant.

As for those "in the middle" - Independents and Libertatrians - the choices are clearer: MAGA (freedom, prosperity and peace); Dem-lite (tradional Dem stances + anti-jab) or radical, extreme Dem (thinly-veiled socialism/Marxism/facism/communism) and will likely split among "usual" Dem/Republican/Libertarian %s with RFK, Jr. garnering most of the votes from those who would usally have voted for the Dem candidate de jour. This number may be significant, but the only harm done will be fewer Dem votes.